Nordson EFD 784S-SS User Manual

784S-SS Aseptic MicroSpray™ Valve

Maintenance & Parts Guide

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784S-SS Aseptic MicroSpray Valve | Maintenance & Parts Guide

Valve Disassembly and
Reassembly Procedures

CAUTION

To prevent damage, the valve must be
disassembled starting at the fluid outlet end of the
valve.

Valve Maintenance: Fluid Body

To thoroughly clean the fluid body and replace
Diaphragm:

1. 1 Remove SS air cap retainer nut, air cap,
and microspray tip adapter from the fluid
body. Dispose of dispensing tip. Do not reuse.

2. 2 Remove the two retainer screws at the top
of the valve to release fluid body.

3. 3 Remove fluid inlet and nozzle air fittings.

4. To reinstall the fluid body, align fluid body
holes with air cylinder body holes and reinsert
retainer screws. Torque to 1.58 Nm (14 inch
pounds).

Tools required:

2.5 mm hex wrench
Adjustable wrench

2

3

1

4

Diaphragm

5. Back out stroke control two turns
counterclockwise from the closed position.

6. Remove fluid body.

7. 4 Insert Allen wrench (2.5 mm) through stroke
reference control and engage piston shaft.

8. Using the hex on the shaft, unthread shaft,
and remove shaft and diaphragm.

9. Install new diaphragm onto needle shaft.

10. With Allen wrench engaged into piston,
thread needle shaft / diaphragm onto piston
assembly.

11. Reinstall fluid body and torque retainer
screws to value specified in step 4.

12. Turn stroke control clockwise until closed,
and then reopen to desired stroke.

5

6

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